Psf Roof Load Shed Roof

Arch 331 note set 13 1 s2014abn 5 location 2uniform load psf kn m roofs ordinary flat pitched and curved roofs roofs used for roof gardens.

Psf roof load shed roof.

It is measured in pounds per square foot psf. Thus a roof designed to carry a snow load of 20 lbs. Many factors influence how a system responds to loading. For example appendix a indicates that one type of clay tile roof system has a live load value of 20 psf and a dead load value of 15 psf.

All loads are listed as pounds per square foot of horizontal projection footprint area. 2attic loads may be included in the floor live load but a 10 psf attic load is typically used only to size ceiling joists adequately for access purposes. Here each square foot of roof system delivers 50 pounds of live load and 15 pounds of dead load 65 psf total to the structural support system. If the snow weighs 10 pounds per cubic foot and there are 1 5 feet on the roof each square foot of the roof is getting 15 pounds of pressure.

To figure out the load on your roof take the depth of snow in feet and multiply it by the weight of a cubic foot of snow. See figure 1 headers. However if the attic is intended for storage the attic live load or some portion should also be considered for the design of. The water content of snow may range from 3 for very dry snow to 33 for a wet heavy snow to nearly 100 for ice.

As shown in the technical drawing below the reeds ferry standard roof has a load capacity rated at 110 pounds psf more than the highest code requirement. An inch of water depth weighs 5 2 lbs. For example fresh snow is soft fluffy and light. Af pa s appendix a lists a variety of live and dead load combinations for floors ceilings and rafters.

On a roof with a slope greater than 4 to 12 the live load limit is typically adjusted downward from 20 psf to 15 psf to allow for the relatively greater dead load on the steeper roof. Factors that influence. The density of snow and hence its load per square foot depends on the type of snow.